31-5000486 Rev. 2
19
Installation Instructions
Troubleshooting
Problem
Possible Causes
Solution
The unit cannot be
turned on.
The unit is not connected to the power supply Connect to power supply
Low voltage
Check if circuit voltage is within rated scope.
The fuse is broken or the breaker shorted out Replace fuse or connect breaker
The unit operates but
stops immediately.
Air inlet/outlet of indoor unit is blocked.
Remove obstacles.
Abnormal cooling or
heating.
Air inlet/outlet of indoor unit is blocked.
Remove obstacles.
Inaccurate temperature setting.
Adjust setting at wired controller.
Doors or windows are opened.
Close the door or windows.
Direct sunshine.
Draw curtain or louver.
Too much heat source in the room.
Reduce heat source.
Filter screen is blocked by dirt.
Clean the filter.
Unit doesn’t run.
When unit is started immediately after it is
just turned off.
Overload protection switch makes it run after
3 minutes delay.
When power is turned on.
Standby operating for about 1 minute.
Mist comes from the
unit.
Under cooling.
Indoor high humidity air is cooled rapidly.
The unit is making
noises
Slight cracking sound is heard when just
turned on.
It is noise when electronic expansion valve
initialization.
There is consecutive sound when cooling.
That’s sound for gas refrigerant flowing in the
unit.
There is sound when unit starts or stops.
That’s sound for gas refrigerant stops flowing.
There is slight and consecutive sound when
unit is running or after running.
That’s sound for operation of drainage
system.
The unit blows out dust. When unit runs after no operation for a long
period.
Dust in indoor unit is blew out.
The unit smells
abnormal
Operating.
The room odor absorbed by the unit is blew
out again.
Indoor unit still runs
after switch off.
After every indoor unit receive “stop” signal,
fan will keep running.
Indoor fan can be set as “ON” or “AUTO”
mode. Under “ON” mode, indoor fan will keep
running after switch off the unit.
Final Check
System Test
Please explain to the customer how to operate the system
by using the Owner’s Manual found with the indoor unit.
Check Items for Test Run
No gas leak from linesets?
Are the linesets insulated properly?
Are the connecting wirings of indoor and outdoor firmly
inserted to the terminal block?
Is the connecting wiring of indoor and outdoor fixed?
Is condensate draining correctly?
Is the ground wire securely connected? Is the indoor
unit securely fixed?
Is power source voltage correct according to local
code?
Is there any odd noise?
Does the cooling temperature drop between 20-30°F?
Does the heating temperature raise between 30-40°F?
Is the room temperature display accurate?
Explaining Operation To the End User
• Using the User Manual, explain to the user how to use
the air conditioner/heat pump, (the remote controller,
adding/removing the air filters, placing or removing
the remote controller from the remote control holder,
cleaning methods, precautions for operation, etc.)
• Review precautions for operation.
• Recommend that the user read the Operating
Instructions carefully.
